Disperse azo dyestuffs

ABSTRACT

The present invention claims dyestuffs of formula (I), wherein D, R 1  to R 7  and n are defined as given in claim  1 , a process for their preparation and their use.

The present invention relates to the field of disperse dyes.

Disperse dyestuffs containing cyanomethyl ester groups are known from literature and are described for example in GB 909,843, DE-A 2130992, GB 1,457,532, GB 1,536,429, FR-A 1,531,147, U.S. Pat. No. 3,776,898, JP 55161857, GB 2,104,088, EP 0 685 531 A1 and WO 95/20014.

The inventor of the present invention has surprisingly found that dyeings on polyester with very good wet fastness properties can be obtained if selected dyestuffs containing one cyanomethylester group as defined below are used.

The present invention claims dyestuffs of the formula I

wherein D is a group of the formula (IIa)

-   -   wherein     -   T¹, T² and T³ are, independently, hydrogen, halogen or nitro;     -   T⁴ is hydrogen, halogen, cyano or nitro;     -   wherein at least one of T¹, T², T³ and T⁴ is not hydrogen;         or a group of the formula (IIb)     -   wherein     -   T⁵ is hydrogen or halogen; and     -   T⁶ is hydrogen —SO₂CH₃, —SCN or nitro;     -   wherein at least one of T⁵ and T⁶ is not hydrogen;         or a group of the formula (IIc)         or a group of the formula (IId)     -   wherein     -   T⁷ is nitro, —CHO or a group of the formula         wherein T¹⁰ is —H, halogen, nitro and cyano;     -   T⁸ is hydrogen or halogen; and     -   T⁹ is nitro, cyano, —COCH₃ or —COOT¹⁰, wherein T¹⁰ is         (C₁-C₄)-alkyl;         or a group of the formula (IIe)         R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is         (C₁-C₄)-alkyl or phenyl;         R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl,         benzyl or phenylethyl;         R³ is hydrogen or methyl;         R⁴ is hydrogen or methyl;         R⁵ is hydrogen, methyl or phenyl;         R⁷ is hydrogen, chloro, methoxy or ethoxy;         n is 0, 1 or 2;         s is 0 or 1;         with the proviso that         in the case R¹, R³, R⁴, R⁵ and R⁷ are hydrogen and n=0         D is a group of the formula (IIc), (IId), (IIe) or (IIa) wherein         T¹ is not nitro     -   if T², T³ and T⁴ are hydrogen,     -   if T² and T³ are hydrogen and T⁴ is chlorine or cyano and     -   if T² and T⁴ are hydrogen and T³ is chlorine; and         with the further proviso that         R² is unsubstituted (C₁-C₆)-alkyl if R¹ is methyl, R³, R⁴, R⁵         and R⁷ are hydrogen and n=0.

Alkyl groups standing for R¹, R⁸ or T¹⁰ may be straight-chain or branched and are preferably methyl, ethyl, n-propyl, i-propyl or n-butyl. The same applies to alkyl groups standing for R², which can in addition be pentyl or hexyl. Substituted alkyl groups standing for R² are preferably substituted by hydroxyl, (C₁-C₄)-alkoxy or halogen.

Halogen standing for T¹, T², T³, T⁴, T⁵ or T⁸ are preferably chlorine or bromine.

Preferred examples for D derive from the following amines:

2-nitroaniline, 3-nitroaniline, 4-nitroaniline, 2-chloro-4-nitroaniline, 4-chloro-2-nitroaniline, 2-bromo-4-nitroaniline, 2,6-dichloro-4-nitroaniline, 2,6-dibromo-4-nitroaniline, 2-chloro-6-bromo-4-nitroaniline, 2,5-dichloro-4-nitroaniline, 2-cyano-4-nitroaniline, 2-cyano-6-bromo-4-nitroaniline, 2-cyano-6-chloro-4-nitroaniline, 2,4-dinitroaniline, 2-chloro-4,6-dinitroaniline, 2-bromo-4,6-dinitroaniline, 2,6-dicyano-4-nitroaniline, 2-cyano-4,6-dinitroaniline, 2-amino-5-nitrothiazole, 2-amino-3,5-dinitrothiophene, 2-amino-3-ethoxycarbonyl-5-nitrothiophene, 2-amino-3-acetyl-5-nitrothiophene, 2-amino-3-cyano-5-nitrothiophene, 2-amino-3-cyano-4-chloro-5-formylthiophene, 7-amino-5-nitrobenzoisothiazole, 2-amino-6-nitrobenzothiazole, 2-amino-6-methylsulphonylbenzothiazole; 2-amino-6-thiocyanatobenzothiazole, 2-amino-5,6-dichlorobenzothiazole and 2-amino-6,7-dichlorobenzothiazole (mixture).

Preferred disperse dyestuffs according to the present invention are of the general formula (Ia)

wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is (C₁-C₄)-alkyl; R² is unsubstituted (C₁-C₆)-alkyl, benzyl or phenylethyl; and n is 0, 1 or 2.

In especially preferred dyestuffs of formula (Ia) R¹ is methyl, R² is ethyl and n is 0.

Other preferred disperse dyestuffs according to the present invention are of the general formula (Ib)

wherein T³ is bromo or chloro; and R² is unsubstituted (C₁-C₈)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl;

In especially preferred dyestuffs of formula (Ib) R² is ethyl, benzyl or phenethyl.

Still other preferred disperse dyestuffs according to the present invention are of the general formula (Ic)

wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is (C₁-C₄)-alkyl or phenyl; R² is unsubstituted (C₁-C₈)-alkyl, substituted (C₁-C₈)-alkyl, benzyl or phenylethyl; and R³ is hydrogen and R⁴ is methyl or R³ is methyl and R⁴ is hydrogen.

Still other preferred disperse dyestuffs according to the present invention are of the general formula (Id)

wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is (C₁-C₄)-alkyl or phenyl; R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; and R⁵ is methyl or phenyl;

Still other preferred disperse dyestuffs according to the present invention are of the general formula (Ie)

wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; R⁶ is (C₁-C₄)-alkyl or phenyl; R⁷ is chloro, methoxy or ethoxy; and n is 0, 1 or 2.

Still other preferred disperse dyestuffs according to the present invention are of the general formula (If)

wherein R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; R⁸ is nitro; and n is 0, 1 or 2;

Still other preferred disperse dyestuffs according to the present invention are of the general formula (Ig)

wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is (C₁-C₄)-allyl or phenyl; R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; and R³ is hydrogen or methyl.

The compounds of the formula I may be obtained by usual methods for the preparation of azo compounds such as by diazotisation of an amine of the formula III D—NH₂  (III) wherein D is defined as given above, and coupling onto a compound of the formula IV

wherein R¹, R², R³, R⁴, R⁵ and R⁷ are defined as given above.

Typically the amine of the formula (III) may be diazotised in an acidic medium, such as acetic, propionic or hydrochloric acid using a nitrosating agent such as nitrosylsulphuric acid, sodium nitrite or methylnitrite at a temperature from −10° C. to 10° C. Coupling onto the compound of the formula (IV) may be achieved by adding the diazotised amine to the compound of the formula (IV) under conditions described in literature and known to the skilled persons. After coupling the compound of the formula (I) may be recovered from the reaction mixture by any convenient means such as filtration. The compounds of the formulae (III) and (IV) are known and can be obtained by methods described in literature or known to the skilled person.

The compounds of the formula (I) are useful for dyeing and printing of synthetic textile material particularly polyester textile materials and fibre blends thereof with for example cellulosic materials like cotton, to which they impart colours which have excellent wet fastness properties.

Dyeing of the fibre goods mentioned with the dyestuffs of the formula (I) can be carried out in a manner known per se, preferably from aqueous dispersions, if appropriate in the presence of carriers, at between 80 and 110° C., by the exhaust process or by the HT process in a dyeing autoclave at 110 to 140° C., and by the so-called thermofixing process, in which the goods are padded with the dye liquor and then fixed at about 180 to 230° C.

The fibre goods mentioned can as well be printed in a manner known per se by a procedure in which the dyestuffs of the formula (I) are incorporated into a printing paste and the goods printed with the paste are treated, if appropriate in the presence of a carrier, with HT steam, pressurized steam or dry heat at temperatures between 180 and 230° C. to fix the dyestuff.

The dyestuffs of the formula (I) should be present in the finest possible dispersion in the dye liquors and printing pastes employed in the above applications.

The fine dispersion of the dyestuffs is effected in a manner known per se by a procedure in which the dyestuff obtained during preparation is suspended in a liquid medium, preferably in water, together with dispersing agents and the mixture is exposed to the action of shearing forces, the particles originally present being comminuted mechanically to the extent that an optimum specific surface area is achieved and sedimentation of the dyestuff is as low as possible. The particle size of the dyestuffs is in general between 0.5 and 5 m, preferably about 1 m.

The dispersing agents used can be nonionic or anionic. Nononic dispersing agents are, for example, reaction products of alkylene oxides, such as, for example, ethylene oxide or propylene oxide, with alkylatable compounds, such as for example fatty alcohols, fatty amines, fatty acids, phenols, alkylphenols and carboxylic acid amines. Anionic dispersing agnets are, for example, lignin-sulphonates, alkyl- or alkylarylsulphonates or alkylaryl polyglycol ethersulphates. For most methods of use, the dyestuff formulations thus obtained should be pourable. The dyestuff and dispersing agent content is therefore limited in these cases. In general, the dispersions are brought to a dyestuff content of up to 50 percent by weight and a dispersing agent content of up to 25 percent by weight. For economic reasons, the dyestuff contents usually do not fall below 15 percent by weight.

The dispersions can also comprise other auxiliaries, for example those which act as oxidizing agents or fungicidal agents. Such agents are well known in the art. The dyestuff dispersion thus obtained can be used very advantageously for the preparation of printing pastes and dye liquors.

For certain fields of use, powder formulations are preferred. These powders comprise the dyestuff, dispersing agents and other auxiliaries, such as, for example, wetting agents, oxidizing agents, preservatives and dust removal agents.

A preferred preparation process for pulverulent dyestuff formulations comprises removing the liquid from the liquid dyestuff dispersions described above, for example by vacuum drying, freeze drying, by drying on roller dryers, but preferably by spray drying.

EXAMPLE 1 4-(4-nitrophenylazo)-3-methyl-N-ethyl-N-(2-cyanomethoxy-carbonylethyl) aniline

4-nitroaniline (4.1 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (50 parts). Nitrosyl sulphuric acid 40% (11.4 parts) was added below 5° C. and the mixture was stirred for 30 minutes.

The diazo solution obtained was added gradually to a stirred coupling mixture of N-ethyl, N-(2-cyanomethoxycarbonylethyl)-m-toluidine (7.3 parts), methanol (50 parts), water (200 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(4-nitrophenylazo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonylethyl) aniline (6.5 parts) λmax=486 nm (acetone)

When applied to polyester materials from aqueous dispersion, red shades with excellent wet and light fastness properties were seen.

The following examples of dyes of formula (Iaa):

were prepared by the procedure of Example 1 (see Table 1) TABLE 1 λmax Example T¹¹ T¹² T¹³ T¹⁴ R⁸ (nm) 2 —H —H —NO₂ —H —C₂H₅ 479 3 —H —NO₂ —H —H —C₂H₅ 468 4 —NO₂ —H —Cl —H —C₂H₅ 508 5 —Cl —H —NO₂ —H —C₂H₅ 501 6 —NO₂ —H —Br —H —C₂H₅ 507 7 —NO₂ —H —Cl —Cl —C₂H₅ 450 8 —NO₂ —H —Br —Br —C₂H₅ 449 9 —NO₂ —H —Cl —Br —C₂H₅ 449 10 —NO₂ —Cl —H —Cl —C₂H₅ 518 11 —NO₂ —H —CN —H —C₂H₅ 534 12 —NO₂ —H —CN —Br —C₂H₅ 544 13 —NO₂ —H —CN —Cl —C₂H₅ 545 14 —NO₂ —H —NO₂ —H —C₂H₅ 535 15 —NO₂ —H —Br —NO₂ —C₂H₅ 542 16 —NO₂ —H —Cl —NO₂ —C₂H₅ 544 17 —NO₂ —H —CN —CN —C₂H₅ 582 18 —NO₂ —H —CN —NO₂ —C₂H₅ 590 19 —NO₂ —H —H —H —C₄H₉ 490 20 —NO₂ —H —Cl —H —C₄H₉ 513 21 —NO₂ —H —Cl —Cl —C₄H₉ 453 22 —NO₂ —H —Cl —Br —C₄H₉ 453 23 —NO₂ —H —Br —Br —C₄H₉ 452 24 —NO₂ —H —CN —H —C₄H₉ 539 25 —NO₂ —H —NO₂ —H —C₄H₉ 540 26 —NO₂ —H —CN —Br —C₄H₉ 549 27 —NO₂ —H —CN —Cl —C₄H₉ 548 28 —NO₂ —H —Br —NO₂ —C₄H₉ 548 29 —NO₂ —H —Cl —NO₂ —C₄H₉ 549 30 —H —H —NO₂ —H —C₄H₉ 483 31 —NO₂ —H —CN —CN —C₄H₉ 586 32 —NO₂ —H —H —H —CH₂[C₆H₅] 479 33 —NO₂ —H —NO₂ —H —CH₂[C₆H₅] 530 34 —H —H —NO₂ —H —CH₂[C₆H₅] 470 35 —H —NO₂ —H —H —CH₂[C₆H₅] 460 36 —NO₂ —H —Cl —H —CH₂[C₆H₅] 498 37 —NO₂ —H —Cl —Cl —CH₂[C₆H₅] 446 38 —NO₂ —H —Br —Br —CH₂[C₆H₅] 445 39 —NO₂ —H —Br —Cl —CH₂[C₆H₅] 444 40 —NO₂ —H —CN —H —CH₂[C₆H₅] 528 41 —NO₂ —H —CN —Br —CH₂[C₆H₅] 539 42 —NO₂ —H —CN —Cl —CH₂[C₆H₅] 539 43 —NO₂ —H —Br —NO₂ —CH₂[C₆H₅] 538 44 —NO₂ —H —Cl —NO₂ —CH₂[C₆H₅] 537 45 —NO₂ —H —CN —NO₂ —CH₂[C₆H₅] 580 46 —NO₂ —H —CN —CN —CH₂[C₆H₅] 577 47 —NO₂ —H —H —H —C₃H₇ 487 48 —NO₂ —H —Cl —H —C₃H₇ 509 49 —NO₂ —H —Cl —Cl —C₃H₇ 452 50 —NO₂ —H —Cl —Br —C₃H₇ 451 51 —NO₂ —H —Br —Br —C₃H₇ 452 52 —NO₂ —H —CN —H —C₃H₇ 536 53 —NO₂ —H —NO₂ —H —C₃H₇ 537 54 —NO₂ —H —CN —Br —C₃H₇ 546 55 —NO₂ —H —CN —Cl —C₃H₇ 548 56 —NO₂ —H —Br —NO₂ —C₃H₇ 544 57 —NO₂ —H —Cl —NO₂ —C₃H₇ 545 58 —H —H —NO₂ —H —C₃H₇ 480 59 —NO₂ —H —CN —CN —C₃H₇ 584 60 —NO₂ —H —Cl —H —CH₃ 504 61 —NO₂ —H —CN —H —CH₃ 529 62 —NO₂ —H —Cl —CN —CH₃ 543 63 —NO₂ —H —Br —CN —CH₃ 542 64 —NO₂ —H —Br —NO₂ —CH₃ 539

EXAMPLE 65 4-(2,6-dichloro-4-nitrophenylazo)-N-ethyl-N-(2-cyanomethoxy-carbonylethyl) aniline

2,6-dichloro-4-nitroaniline (6.2 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (11.4 parts) was added below 5° C. and the mixture was stirred for 30 minutes. The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-2(cyanomethoxycarbonylethyl)-aniline (8.3 parts), methanol (50 parts), water (300 parts) and sulphamic acid (1 part). After one hour the product was isolated by filtration, washed with cold water and dried to yield, 4-(2,6-dichloro-4-nitrophenylazo)-N-ethyl-N-(2-cyanomethoxycarbonylethyl) aniline (9.5 parts) λmax=432 nm (acetone)

When applied to polyester materials from aqueous dispersion, yellow brown shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iba)

were prepared by the procedure of Example 65 (see Table 2) TABLE 2 λmax Example T¹⁵ T¹⁶ R⁹ (nm) 66 —Cl —Cl —C₃H₇ 433 67 —Cl —Cl —C₄H₉ 434 68 —Cl —Cl —CH₂[C₆H₅] 420 69 —Cl —Cl —CH₃ 425 70 —Cl —Br —C₂H₅ 430 71 —Cl —Br —C₃H₇ 431 72 —Cl —Br —C₄H₉ 433 73 —Cl —Br —CH₂[C₆H₅] 420 74 —Cl —Br —CH₃ 424 75 —Br —Br —C₂H₅ 430 76 —Br —Br —C₃H₇ 432 77 —Br —Br —C₄H₉ 431 78 —Br —Br —CH₂[C₆H₅] 421 79 —Br —Br —CH₃ 424

EXAMPLE 80 4-(6-nitrobenzothiazol-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonylethyl) aniline

2-amino-6-nitrobenzothiazole (3.9 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (7.6 parts) was added below 5° C. and the mixture was stirred for 1 hour. The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(2-cyanomethoxycarbonylethyl)-m-toluidine (5.9 parts), methanol (25 parts), water (200 parts) and sulphamic acid (0.5 parts). After one hour the product was isolated by filtration, washed with cold water and dried to yield, 4-(6-nitrobenzothiazol-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonyl ethyl) aniline (2.4 parts) λmax=545 nm (acetone)

When applied to polyester materials from aqueous dispersion, rubine shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iab):

were prepared by the procedure of Example 80 (see Table 3) TABLE 3 Example T¹⁷ T¹⁸ R¹⁰ R¹¹ λmax nm 81 —SO₂CH₃ —H —CH₃ —CH₃ 527 82 —NO₂ —H —CH₃ —CH₃ 543 83 —NO₂ —H —CH₃ —C₃H₇ 545 84 —NO₂ —H —CH₃ —C₄H₉ 548 85 —NO₂ —H —CH₃ —CH₂[C₆H₅] 538 86 —Cl —Cl —CH₃ —C₂H₅ 526 87 —Cl —Cl —CH₃ —CH₃ 522 88 —Cl —Cl —CH₃ —C₃H₇ 528 89 —Cl —Cl —CH₃ —C₄H₉ 530 90 —Cl —Cl —CH₃ —CH₂[C₆H₅] 521 91 —SO₂CH₃ —H —CH₃ —C₃H₇ 531 92 —SO₂CH₃ —H —CH₃ —C₄H₉ 533 93 —SO₂CH₃ —H —CH₃ —CH₂[C₆H₅] 525 94 —SCN —H —CH₃ —C₂H₅ 534 95 —SCN —H —CH₃ —CH₃ 530 96 —SCN —H —CH₃ —C₃H₇ 535 97 —SCN —H —CH₃ —C₄H₉ 537 98 —SCN —H —CH₃ —CH₂[C₆H₅] 529 99 —NO₂ —H —H —C₄H₉ 535 100 —NO₂ —H —H —CH₂[C₆H₅] 525 101 —SCN —H —H —C₄H₉ 523 102 —SCN —H —H —CH₂[C₆H₅] 516 103 —Cl —Cl —H —C₄H₉ 519 104 —Cl —Cl —H —CH₂[C₆H₅] 509 105 —SO₂CH₃ —H —H —C₄H₉ 521 106 —SO₂CH₃ —H —H —CH₂[C₆H₅] 512

EXAMPLE 107 4-(3,5-dinitrothiophen-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonylethyl)

2-amino-3,5-dinitrothiophene (3.1 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (50 parts) Nitrosyl sulphuric acid 40% (5.7 parts) was added below 5° C. and the mixture was stirred for 30 mins. The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(2-cyanomethoxycarbonyethyl)-m-toluidine (4.0 parts), acetone (50 parts), water (300 parts) and sulphamic acid (0.5 parts). After one hour the product was isolated by filtration, washed with cold water and dried to yield, 4-(3,5-dinitrothiophen-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonyl-ethyl) aniline (3.0 parts) λmax=640 nm (acetone)

When applied to polyester materials from aqueous dispersion, blue shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iac):

were prepared by the procedure of Example 107 (see Table 4) TABLE 4 Ex- λmax ample T¹⁹ T²⁰ T²¹ R¹² R¹³ (nm) 108 —NO₂ —NO₂ —H —H —C₂H₅ 620 109 —NO₂ —NO₂ —H —H —C₄H₉ 625 110 —NO₂ —NO₂ —H —H —C₃H₇ 622 111 —NO₂ —NO₂ —H —H —CH₂[C₆H₅] 611 112 —NO₂ —NO₂ —H —CH₃ —C₄H₉ 645 113 —NO₂ —NO₂ —H —CH₃ —C₃H₇ 640 114 —NO₂ —NO₂ —H —CH₃ —CH₂[C₆H₅] 632 115 —COOC₂H₅ —NO₂ —H —CH₃ —C₂H₅ 595 116 —COOC₂H₅ —NO₂ —H —H —C₄H₉ 583 117 —COCH₃ —NO₂ —H —CH₃ —C₂H₅ 599 118 —COCH₃ —NO₂ —H —CH₃ —C₄H₉ 603 119 —COCH₃ —NO₂ —H —H —C₄H₉ 585 120 —CN —NO₂ —H —CH₃ —C₂H₅ 604 121 —CN —NO₂ —H —CH₃ —CH₂[C₆H₅] 595 122 —CN —CHO —Cl —CH₃ —C₂H₅ 585 123 —CN —CHO —Cl —CH₃ —C₄H₉ 591 124 —CN —CHO —Cl —H —C₄H₉ 579 125 —COOC₂H₅ —NO₂ —H —H —CH₂[C₆H₅] 565 126 —COOC₂H₅ —NO₂ —H —CH₃ —C₄H₉ 601

EXAMPLE 127 4-(5-nitrobenzisothiazol-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonylethyl) aniline

7-amino-5-nitrobenzoisothiazole (2.9 parts) was added to a mixture of sulphuric acid 98% (15 parts) and phosphoric acid (4 parts) stirring at room temperature. The mixture was heated to 55° C. and was stirred at that temperature for 30 mins. Nitrosyl sulphuric acid 40% (6.1 parts) was added below 5° C. and the mixture was stirred for 2 hrs.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(2-cyanomethoxycarbonylethyl)-m-toluidine (4.8 parts), acetone (50 parts), water (100 parts) and sulphamic acid (0.5 parts). Sodium acetate was added to increase the pH to 4.0 and the mixture was stirred for 1 hour. The product was isolated by filtration, washed with cold water and dried to yield, 4-(5-nitrobenzisothiazol-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonylethyl) aniline (2.4 parts) λmax=601 nm (acetone)

When applied to polyester materials from aqueous dispersion, blue shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iad)

were prepared by the procedure of Example 127 (see Table 5) TABLE 5 λmax Example R¹⁴ R¹⁵ (nm) 128 —H —C₂H₅ 588 129 —H —CH₂[C₆H₅] 578 130 —H —C₄H₉ 589 131 —CH₃ —C₃H₇ 603 132 —CH₃ —CH₂[C₆H₅] 593 133 —CH₃ —C₄H₉ 608

EXAMPLE 134 4-(5-nitrothiazol-yl-azo)-N-butyl-N-(2-cyanomethoxy- carbonylethyl) aniline

2-amino-5-nitrothiazole (2.9 parts) was set stirring at 5° C. with a mixture of acetic acid, 86:14 (50 parts). Nitrosyl sulphuric acid 40% (7.0 parts) was added below 5° C. and the mixture was stirred for 30 mins. The diazo solution was added gradually to a stirred coupling mixture of N-butyl, N-2(cyanomethoxycarbonylethyl)-aniline (5.2 parts), acetone (50 parts), water (200 parts) and sulphamic acid (0.5 parts). After one hour the product was isolated by filtration, washed with cold water and dried to yield, 4-(5-nitrothiazol-yl-azo)-N-butyl-N-(2-cyanomethoxycarbonylethyl) aniline (2.9 parts) λmax=571 nm (acetone)

When applied to polyester materials from aqueous dispersion, blue shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iae)

were prepared by the procedure of Example 134 (see Table 6) TABLE 6 λmax Example R¹⁶ R¹⁷ (nm) 135 —H —CH₂[C₆H₅] 557 136 —CH₃ —C₂H₅ 575 137 —CH₃ —C₄H₉ 582 138 —CH₃ —CH₂[C₆H₅] 569

EXAMPLE 139 4(2-chloro-4-nitrophenylazo)-3-acetylamino-N-ethyl-N-(2-cyanomethoxycarbonylethyl)-aniline

2-chloro-4-nitroaniline (3.5 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (7.0 parts) was added below 5° C. and the mixture was stirred for 30 minutes. The diazo solution was added gradually to a stirred coupling mixture of 3(N-ethyl, N-cyanomethoxycarbonylethyl)-amino-acetanilide (6.3 parts), methanol (40 parts), water (200 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(2-chloro-4-nitrophenylazo)-3-acetylamino-N-ethyl-N-(2-cyanomethoxy-carbonylethyl)-aniline (4.1 parts) λmax=525 nm (acetone)

When applied to polyester materials from aqueous dispersion, rubine shades with excellent wet and light fastness properties were seen.

The following examples of dyes of formula (Iea):

were prepared by the procedure of Example 139 (see Table 7) TABLE 7 λmax Example D′ R¹⁸ R¹⁹ R²⁰ (nm) 140

—CH₃ —H —C₂H₅ 550 141

—H —C₂H₅ 553 142

—CH₃ —H —C₄H₉ 552 143

—C₂H₅ —H —C₂H₅ 550 144

—CH₃ —OCH₃ —C₂H₅ 596 145

—CH₃ —OCH₃ —C₄H₉ 603 146

—OCH₃ —H 600 147

—C₂H₅ —OCH₃ —C₂H₅ 596 148

—CH₃ —H —C₄H₉ 551 149

—CH₃ —H —C₂H₅ 574 150

—C₂H₅ —H —C₂H₅ 550 151

—CH₃ —H —C₄H₉ 525 152

—CH₃ —OCH₃ —C₂H₅ 628 check 153

—CH₃ —H —C₂H₅ 539 154

—CH₃ —OCH₃ —C₂H₅ 574 155

—CH₃ —H —C₂H₅ 634 156

—CH₃ —OCH₃ —C₂H₅ 660

EXAMPLE 157 4-(2-cyano-4-nitrophenylazo)-3-methyl-N-ethyl-N-(4-cyanomethoxycarbonylbutyl)-aniline

2-cyano-4-nitroaniline (3.2 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (50 parts). Nitrosyl sulphuric acid 40% (7.6 parts) was added below 5° C. and the mixture was stirred for 30 minutes.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(4-cyanomethoxycarbonylbutyl)-m-toluidine (6.0 parts), methanol (50 parts), water (200 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(2-cyano-4-nitrophenylazo)-3-methyl-N-ethyl-N-(4-cyanomethoxycarbonyl butyl)-aniline.

(5.3 parts) λmax=548 nm (acetone)

When applied to polyester materials from aqueous dispersion, rubine shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iaf)

were prepared by the procedure of Example 157 (see Table 8) TABLE 8 Ex- λmax ample D″ R²¹ R²² n (nm) 158

—H —C₂H₅ 4 491 159

—H —C₂H₅ 3 486 160

—CH₃ —C₂H₅ 4 649 161

—CH₃ —C₂H₅ 3 642 162

—CH₃ —C₂H₅ 4 561 163

—CH₃ —C₂H₅ 3 556 164

—CH₃ —C₃H₇ 3 558 165

—CH₃ —C₂H₅ 4 535 166

—CH₃ —C₂H₅ 4 548 167

—CH₃ —C₂H₅ 3 536 168

—H —C₂H₅ 4 529

EXAMPLE 169 4-nitrophenylazo)-3-methyl-N-ethyl-N-(2-(1-cyanoethoxy) carbonylethyl)-aniline

2-cyano-4-nitroaniline (2.1 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (4.9 parts) was added below 5° C. and the mixture was stirred for 30 minutes.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(2-(1-cyanoethoxy)carbonylethyl)-m-toluidine (3.7 parts), acetone (50 parts), water (300 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(2-cyano-4-nitrophenylazo)-3-methyl-N-ethyl-N-(2-(1-cyanoethoxy) carbonylethyl)-aniline (3.5 parts) λmax=534 nm (acetone)

When applied to polyester materials from aqueous dispersion, rubine shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Ida)

were prepared by the procedure of Example 169 (see Table 9) TABLE 9 λmax Example D′′′ R²³ R²⁴ R²⁵ (nm) 170

—CH₃ —C₂H₅

533 171

—CH₃ —C₂H₅

544 172

—CH₃ —C₂H₅

507 173

—CH₃ —C₂H₅

446 174

—CH₃ —C₂H₅

580 175

—H —C₂H₅

523 176

—H —C₂H₅

494 177

—H —C₂H₅ —CH₃ 522 178

—H —C₂H₅ —CH₃ 473 179

—H —C₄H₉ —CH₃ 480 180

—H —C₂H₅ —CH₃ 494 181

—H —C₂H₅ —CH₃ 439 182

—H —C₄H₉ —CH₃ 441 183

—H —C₂H₅ —CH₃ 521 184

—H —C₂H₅ —CH₃ 533 185

—H —C₂H₅ —CH₃ 590 186

—CH₃ —C₂H₅ —CH₃ 449 187

—CH₃ —C₂H₅ —CH₃ 544 188

—CH₃ —C₂H₅ —CH₃ 581 189

—CH₃ —C₂H₅ —CH₃ 544 190

—CH₃ —C₂H₅ —CH₃ 533 191

—CH₃ —C₂H₅ —CH₃ 601 192

—CH₃ —C₂H₅ —CH₃ 506 193

—H —C₂H₅ —CH₃ 640

EXAMPLE 194 4-(2-chloro-4-nitrophenylazo)-N-ethyl-N-(2-cyanomethoxy carbonylpropyl)-aniline

2-chloro-4-nitroaniline (parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (4.9 parts) was added below 5° C. and the mixture The diazo solution was stirred for 30 minutes.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-2-(cyanomethoxycarbonylpropyl)-aniline (parts), acetone (50 parts), water (300 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(2-chloro-4-nitrophenylazo)-N-ethyl-N-(2-cyanomethoxycarbonylpropyl)-aniline (3.5 parts) λmax=534 nm (acetone)

When applied to polyester materials from aqueous dispersion, red shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Ica)

were prepared by the procedure of Example 194 (see Table 10) TABLE 10 λmax Example D′′′′ R²⁶ R²⁷ R²⁸ (nm) 195

—H —H —CH₃ 521 196

—H —H —CH₃ 473 197

—H —H —CH₃ 440 198

—H —H —CH₃ 521 199

—H —H —CH₃ 569 200

—CH₃ —H —CH₃ 505 201

—CH₃ —H —CH₃ 448 202

—CH₃ —H —CH₃ 532 203

—CH₃ —H —CH₃ 541 204

—CH₃ —H —CH₃ 579 205

—CH₃ —H —CH₃ 525 206

—CH₃ —H —CH₃ 541 207

—CH₃ —H —CH₃ 599 208

—H —H —CH₃ 588 209

—CH₃ —CH₃ —H 535 210

—CH₃ —CH₃ —H 544 211

—CH₃ —CH₃ —H 594 212

—CH₃ —CH₃ —H 549

EXAMPLE 213 4-(4-nitrophenylazo)-N-ethyl-N-(2-(1-cyanoethoxy) carbonylpropyl)-aniline

4-nitroaniline (2.0 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (50 parts). Nitrosyl sulphuric acid 40% (5.7 parts) was added below 5° C. and the mixture was stirred for 30 minutes.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(2-(1-cyanoethoxy)carbonylpropyl)-aniline (4.7 parts), acetone (50 parts), water (200 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(4-nitrophenylazo)-N-ethyl-N-(2-(1-cyanoethoxy)carbonylpropyl)-aniline

(2.9 parts) λmax=473 nm (acetone)

When applied to polyester materials from aqueous dispersion, scarlet shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Ih):

were prepared by the procedure of Example 213 (see Table 11) TABLE 11 Ex- λmax ample D′′′′′ R²⁹ R³⁰ R³¹ (nm) 214

—H —CH₃ —CH₃ 519 215

—CH₃ —CH₃ —CH₃ 504 216

—CH₃ —CH₃ —CH₃ 531 217

—CH₃ —CH₃ —CH₃ 537 218

—CH₃ —CH₃ —CH₃ 597 219

—H —CH₃ —CH₃ 517 220

—H —CH₃ —CH₃ 428 221

—H —CH₃ —CH₃ 428 222

—CH₃ —CH₃ —CH₃ 449 223

—CH₃ —CH₃ —CH₃ 539 224

—CH₃ —CH₃ —CH₃ 524

EXAMPLE 225 4-(2-cyano-4-nitrophenylazo)-N-ethyl-N-(1-cyanomethoxy carbonylethyl)-m-toluidine

2-cyano-4-nitroaniline (3.1 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (6.6 parts) was added below 5° C. and the mixture was stirred for 30 minutes.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(1-cyanomethoxycarbonylethyl)-m-toluidine (4.1 parts), methanol (40 parts), water (200 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(2-cyano-4-nitrophenylazo)-N-ethyl-N-(1-cyanomethoxycarbonylethyl)-m-toluidine (3.9 parts) λmax=510 nm (acetone)

When applied to polyester materials from aqueous dispersion, red shades with excellent wet and light fastness properties were seen. 

1. Dyestuff of the formula I

wherein D is a group of the formula (IIa)

wherein T¹, T² and T³ are, independently, hydrogen, halogen or nitro; T⁴ is hydrogen, halogen, cyano or nitro; wherein at least one of T¹, T², T³ and T⁴ is not hydrogen; or a group of the formula (IIb)

wherein T⁵ is hydrogen or halogen; and T⁶ is hydrogen —SO₂CH₃, —SCN or nitro; wherein at least one of T⁵ and T⁶ is not hydrogen; or a group of the formula (IIc)

or a group of the formula (IId)

wherein T⁷ is nitro, —CHO or a group of the formula

wherein T¹⁰ is —H, halogen, nitro and cyano; T⁸ is hydrogen or halogen; and T⁹ is nitro, cyano, —COCH₃ or —COOT¹⁰, wherein T¹⁰ is (C₁-C₄)-alkyl; or a group of the formula (IIe)

R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is (C₁-C₄)-alkyl or phenyl; R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; R³ is hydrogen or methyl; R⁴ is hydrogen or methyl; R⁵ is hydrogen, methyl or phenyl; R⁷ is hydrogen, chloro, methoxy or ethoxy; n is 0, 1 or 2; s is 0 or 1; with the proviso that in the case R¹, R³, R⁴, R⁵ and R⁷ are hydrogen and n=0 D is a group of the formula (IIc), (IId), (IIe) or (IIa) wherein T¹ is not nitro if T², T³ and T⁴ are hydrogen, if T² and T³ are hydrogen and 4 is chlorine or cyano and if T² and T⁴ are hydrogen and T³ is chlorine; and with the further proviso that R² is unsubstituted (C₁-C₆)-alkyl if R¹ is methyl, R³, R⁴, R⁵ and R⁷ are hydrogen and n=0.
 2. Dyestuff according to claim 1 of the formula (Ia)

wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is (C₁-C₄)-alkyl; R² is unsubstituted (C₁-C₆)-alkyl, benzyl or phenylethyl; and n is 0, 1 or
 2. 3. Dyestuff according to claim 1 of the formula (Ib)

wherein T³ is bromo or chloro; and R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl.
 4. Dyestuff according to claim 1 of the formula (Ic)

wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is (C₁-C₄)-alkyl or phenyl; R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; and R³ is hydrogen and R⁴ is methyl or R³ is methyl and R⁴ is hydrogen.
 5. Dyestuff according to claim 1 of the formula (Id)

wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is (C₁-C₄)-alkyl or phenyl; R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; and R⁵ is methyl or phenyl.
 6. Dyestuff according to claim 1 of the formula (Ie)

wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; R⁶ is (C₁-C₄)-alkyl or phenyl; R⁷ is chloro, methoxy or ethoxy; and n is 0, 1 or
 2. 7. Dyestuff according to claim 1 of the formula (If)

wherein R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; R⁸ is nitro; and n is 0, 1 or
 2. 8. Dyestuff according to claim 1 of the formula (Ig)

wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is (C₁-C₄)-alkyl or phenyl; R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; and R³ is hydrogen or methyl.
 9. Process for the preparation of a dyestuff as claimed in claim 1, which comprises diazotizing an amine of the formula III D—NH₂  (III) wherein D is a group of the formulae (IIa), (IIb) (IIc), (IId) or (IIe), and coupling onto a compound of the formula IV

wherein R¹, R², R³, R⁴, R⁵ and R⁷ are defined in claim
 1. 10. (canceled)
 11. A process for dyeing and printing of synthetic textile material and fibre blends thereof which comprises contacting the dyestuff as claimed in claim 1 with the material. 